No, but I can make one. A slit would work but they are, from experience, difficult to manufacture.

A 3D model of a long, straight gray beam with a cut-out section, suggesting a potential design for a slot in construction materials.
 
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tobbbias and 1 other
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What are the dimensions of the roof beams? If they are narrow dimensions, it is difficult to insert metal plates. One could also consider the opposite according to the sketch, having double roof beams and extending a beam, or a flat steel that supports the pergola, which can then be simply "clad" with wood.
 
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justusandersson
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Deep slots are difficult to manufacture. You have to saw them with a band saw and chisel out the rest. I think both suggestions from @bossespecial are worth considering. The important thing is to include the pergola construction from the start in the plans. A good construction should be visible.
 
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bossespecial
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J justusandersson said:
No, but I can make one. A slot would work, but from experience, they are difficult to manufacture.

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Nice, I like this. A lid on top outside for moisture?

B bossespecial said:
What is the dimension of the roof beams? If they are narrow dimensions, it is difficult to slot in sheets. You could also think the opposite according to the sketch, having double roof beams and sticking out a board or a flat steel that supports the pergola, which can then just be "clad" in wood.
I don't know the dimensions yet, we're going to start detailed planning shortly so I wanted to be proactive with this part :) The span is only between 4 m to 4.87 m on this building, so the beams will probably be quite light.
Wooden house exterior with flat green roof and patio, featuring exposed roof beams for future construction, viewed from above in a 3D model.

Double roof beams are not a bad idea. That feels sensible, we've got something there. Thanks for the great input, everyone! It's appreciated. Now I just have to come up with something constructive about moisture-proofing for the housing company. Justus, you mentioned sheet metal - a flashing over where the beam goes through the facade along the entire roof?

Digital sketch illustrating a roof beam structure with layered design, highlighting possible moisture protection considerations in construction planning.
 
Yes, or a sheet for each protruding pergola beam.
 
Got a response from the house manufacturer that they would have done exactly like this, but that they do not want to undertake it as part of their design process because it is a risk construction. Feels a bit tricky to tackle this just with the craftsmen, don't you think?
 
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